Obama’s Response to a 9-Year-Old’s Letter About Putting a Woman on U.S. Currency

President Obama made waves last year when he mentioned he had received a letter from a little girl asking him to put some women on U.S. currency, which he called a “pretty good idea.” That letter was from Sofia, a Massachusetts girl who was just finishing third grade at the time.

“I was studying Ann Hutchinson, who stood up for women’s rights,” she says. “Almost everyone who chose a boy, on their poster they had pictures of different dollar bills or coins with their person on it. So I noticed, why don’t women have coins or dollar bills with their faces on it?”

Sofia, now 9, then says. “I just came home from school and said, ‘I need to write to the president.’” Sofia’s mother provided her letter exclusively to TIME:

Obama’s response:

In the months since Sofia wrote to Obama, a campaign to put a woman on the $20 bill has gone viral. The W20 movement is hosting an online poll so the public can vote on which woman should replace Andrew Jackson. The group plans to petition Obama and the Treasury Secretary to make it happen. Almost 220,000 people have voted in the online poll so far. And Sofia, who is now in fourth grade, is a junior ambassador for the campaign.

Even though she’s a longtime fan of Ann Hutchinson, Sofia wants to see Rosa Parks on the $20. “What she did was really important,” she says. “If it wasn’t for her, we’d still be segregated today.” She got her whole class to vote in the online poll, and her third grade teacher got her class to vote as well.